docs: def delete(self):
          """Get rid of this, starting now.
  
          Apart from deleting the node, this also informs all its users
          that it doesn't exist and therefore can't be their avatar
          anymore.
  
          """
          if self.name in self.character.portal:
              del self.character.portal[self.name]
          if self.name in self.character.preportal:
              del self.character.preportal[self.name]
          for contained in list(self.contents()):
              contained.delete()
          for user in list(self.users.values()):
              user.del_avatar(self.character.name, self.name)
          branch, turn, tick = self.engine._nbtt()
          self.engine._nodes_cache.store(
              self.character.name, self.name,
              branch, turn, tick, False
          )
          self.engine.query.exist_node(
              self.character.name, self.name,
              branch, turn, tick, False
          )
          self.character.node.send(self.character.node, key=self.name, val=None)